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Remove pointless document.

There are no plans to implement this, but it is showing up in search
results, causing confusion.

Bug: 1101487
Change-Id: I9737313f80f6c6a24cce0bf9be976145f3449e96
Fixed: 1101487
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2278365
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784526}